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Related party transactions - Summary of Related Party Transactions (Detail) - Ericsson Nikola Tesla [member] - SEK (kr) kr in Billions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of transactions between related parties [line items] |  |  |
Sales to Ericsson Nikola Tesla | kr 0.4 | kr 0.4 | kr 0.3
Purchases from Ericsson Nikola Tesla | kr 1.6 | kr 1.6 | kr 1.5

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